<template>
	<view>
		<view class="search-box">
			<uni-search-bar @input="input" radius="100" cancelButton="none" focus="true"></uni-search-bar>
		</view>

		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length !==0">
			<view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="goDetails(item)">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="arrowright" size="16"></uni-icons>
			</view>
		</view>

		<!-- 搜索历史 -->
		<view class="history-box" v-else>
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons @click="dropHistory()" type="trash" size="30"></uni-icons>
			</view>
			<!-- 列表区域 -->
			<view class="history-list">
				<uni-tag @click="goGoodsList(item)" :text="item" v-for="(item,i) in historyList" :key="i"></uni-tag>
			</view>
		</view>

	</view>
</template>

<script>
	export default {
		data() {
			return {
				//防抖延时器
				timer: null,
				// 搜索关键词
				kw: '',
				//搜索查询数据
				searchResults: [],
				//历史记录
				historyList: []
			};
		},
		//初始化加载本地历史记录
		onLoad(){
			this.historyList = JSON.parse(uni.getStorageSync('kw')||'[]')
		},
		methods: {
			//input输入事件的处理函数
			input(e) {
				//防抖延时器实现.5s内没有新输入的才会被查询
				clearTimeout(this.timer)
				this.timer = setTimeout(() => {
					//去除前后空格
					this.kw = e.trim()
					this.getSearchList()
				}, 500)

			},
			async getSearchList() {
				//判断搜索词是否为空
				if (this.kw.length === 0) {
					this.searchResults = []
					return
				}
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/goods/qsearch', {
					query: this.kw
				})
				if (res.meta.status !== 200) return uni.$showMsg()
				this.searchResults = res.message
				this.savaSearchHistory()
				
			},
			goDetails(item) {
				uni.navigateTo({
					url: `/subpkg/goods_detail/goods_detail?goods_id=${item.goods_id}`
				})
			},
			savaSearchHistory(){
				//unshift()直接在数组前加入
				// this.historyList.unshift(this.kw)
				//利用set对象里没有重复的特性，给数组去重
				this.historyList.unshift(this.kw)
				const set = new Set(this.historyList)
				// set.delete(this.kw)
				// set.add(this.kw)
				this.historyList = Array.from(set)
				
				//将搜索记录持久化保存到本地
				uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
			dropHistory(){
				this.historyList= [],
				uni.removeStorageSync('kw')
			},
			goGoodsList(kw){
				uni.navigateTo({
					url:`/subpkg/goods_list/goods_list?query=${kw}`
				})
			}

		}
	}
</script>

<style lang="scss">
	.search-box {
		position: sticky;
		top: 0;
		z-index: 999;
	}

	.sugg-list {
		padding: 0 5px;

		.sugg-item {
			font-size: 12px;
			padding: 13px 0;
			display: flex;
			border-bottom: 1px solid #efefef;
			align-items: center;
			justify-content: space-between;
		}

		.goods-name {
			white-space: nowrap;
			overflow: hidden;
			text-overflow: ellipsis;
			margin: 3px;
		}
	}
	.history-box{
		padding: 0 5px;

		.history-title{
			display: flex;
			justify-content: space-between;
			align-items: center;
			height: 40px;
			font-size: 13px;
			border-bottom: 1px solid #efefef;
			margin-bottom: 5px;
		}
		.history-list{
			display: flex;
			flex-wrap: wrap;
			.uni-tag{
				margin-right: 5px;
			}
		}
	}
</style>
